CVE-2026-18515
Received Received - Intake

IBM i Navigator for i File System Bypass

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: IBM Corporation

Description
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to place files into the file system with Navigator for i when they should be blocked by Navigator configuration. This could allow attackers to upload files onto the system to places the Navigator support did not intend, but only if the profile could already do that by itself.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-14
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-18515
EUVD
EUVD-2026-77762

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ibm navigator_for_i *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

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Executive Summary

IBM i systems running Navigator for i versions 7.6, 7.5, 7.4, and 7.3 have a flaw where remote authenticated attackers can bypass Navigator configuration to place files into the file system. This only works if the user's profile already has permission to write files directly.

Detection Guidance

This vulnerability involves unauthorized file uploads via IBM Navigator for i. To detect it, monitor file system changes in directories accessible through Navigator, especially where users have write permissions. Check for unexpected files or modifications in paths like /QIBM/UserData/Navigator, /www/navigator, or user-specific directories. Review Navigator configuration files for misconfigured access controls.

Impact Analysis

An attacker could upload malicious files to unintended locations on your IBM i system. This could lead to unauthorized code execution, data theft, or system compromise if combined with other vulnerabilities.

Compliance Impact

This vulnerability could violate compliance requirements by allowing unauthorized file access or modification. GDPR may be impacted if personal data is exposed, while HIPAA could be affected if protected health information is compromised.

Mitigation Strategies

Immediately review and restrict file upload permissions in IBM Navigator for i. Ensure Navigator configuration blocks unauthorized paths and validate user profiles have only necessary access. Disable or restrict Navigator for i if not required. Apply IBM fixes or updates if available. Monitor for suspicious file uploads or system changes.

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